int getdefaultgateway(in_addr_t * addr)
{
  FILE *p;
  char ip[20];

  p=popen("/usr/sbin/route -n get 0.0.0.0 | grep gateway | awk -e '{print $2}'",
"r");
  fscanf(p,"%s", &ip);
  *addr=inet_addr(ip);
  return 0;

}